Re: Clarification on NFS Tracepoint Build Warnings

[Steven Rostedt <rostedt@goodmis.org>]

On Sat, 24 Oct 2026 22:23:51 +0530
Yalagada Pavan Kumar <pavankumaryalagada@gmail.com> wrote:

> Hi Julia,
> 
> Using the attached configuration [1], i encountered few tracepoint warnings
> during the kernel build. I focused on these three NFS warnings:
> 
> warning: tracepoint 'nfs_local_open_fh' is unused in module fs/nfs/nfs.o
> warning: tracepoint 'nfs_atomic_open_exit' is unused in module fs/nfs/nfs.o
> warning: tracepoint 'nfs_atomic_open_enter' is unused in module fs/nfs/nfs.o
> 


> Could you please let me know whether my understanding is correct and whether
> guarding the tracepoint definition with CONFIG_NFS_LOCALIO is the apprpriate
> fix?

You are correct. Each warning may require a different fix. The
nfs_local_open_fh was not used because CONFIG_NFS_LOCALIO was not
enabled, and the TRACE_EVENT() macro should be guarded by that as your
patch does.

The nfs_atomic_open_exit/exit tracepoints are called in fs/nfs/dir.c
and if you see where they are used, there is:

#if IS_ENABLED(CONFIG_NFS_V4)

Around the use cases of the callers of the tracepoint. Your config
doesn't have that set, which is why they were not used. The solution
for those is to protect the TRACE_EVENT() definitions of those
tracepoints with the guard above.

-- Steve